FPCN39 CWLW 061434
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 8:00 AM PDT Wednesday 6 August 1997 FOR TODAY.

VENTILATION INDICES (TEMPERATURE) AND MIXING HEIGHTS.
MIXING HEIGHTS IN METRES ABOVE SEA LEVEL.
AVERAGE WINDS IN KNOTS.

SPOT INDICES ARE DETERMINED BY THE ASPECT AND ELEVATION OF THE SITES.
COMPARE WINDS, TEMPERATURES AND ELEVATION WITH THE SITES HERE
TO DETERMINE THE INDEX IN ANY OTHER AREA.

SOUTHERN INTERIOR

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
FRSR CANYN   KEL      15   25     500   2     38   33    1100   4
KAMLOOPS     KEL      15   25     600   2     46   34    1550   4
OKANAGAN     KEL      14   25     600   2     46   34    1550   4
CASTLEGAR    SPOK     20   25     800   4     59   33    1500   7
CRANBROOK    SPOK      9   23     950   9    100   32    3950  10
REVELSTOKE   KEL      11   23     550   2     34   31    1200   4

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  15   SW  22
CRANBROOK             VR   5   SW  20

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1600 m         42 C
SPOKANE         1300 m         32 C

TODAY'S VENTING: fair.

VENTING FOR THURSDAY: good.

VENTING OUTLOOK FRIDAY THRU SUNDAY: decreasing to fair thru the period.


CENTRAL INTERIOR/NORTHEAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
WILLIAMS L   P.G.      9   20     950   6     98   29    2500  11
PR. GEORGE   P.G.      9   19     700   6     41   26    1300   6
SMITHERS     P.G.     12   17     700   2     29   24    1000   5
WELLS GRAY   P.G.      9   19    1000   6     89   28    2400  10
FT NLSN      F.N.     29   21     500  18     83   26    1100  16
FT STJOHN    F.N.      9   21     700  16     95   26    2300  10

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  19   SW  31
SMITHERS              SW  20   SW  31

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1400 m         31 C
FT. NELSON       800 m         27 C

TODAY'S VENTING: generally good.

VENTING FOR THURSDAY: good.

VENTING OUTLOOK FRIDAY THRU SUNDAY: good.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     50   20     450  13     53   23     500  13
FRASER VLY   QUIL     52   21     450  13     54   27     750  13
SRN VRISL    QUIL     43   18     450  10     47   23     500  10
CNTRL VRISL  QUIL     45   21     450  10     54   26     600  10
NRN VRISL    HRDY     25   17     600   3     31   19     800   3
TERRACE      ANT       9   17     250   4     78   22    2000   6
STEWART      ANT      29   18     500   4     44   22    1150   4

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   15   W   19   SW  37
PORT HARDY   NW  20   W   19   SW  30
SANDSPIT     W   20   W   22   W   22

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      2000 m         36 C
PORT HARDY      1900 m         32 C
ANNETTE         none

TODAY'S VENTING: generally only fair.

VENTING FOR THURSDAY: good.

VENTING OUTLOOK FRIDAY THRU SUNDAY: decreasing to fair.

VENTILATION GUIDELINES:
          0-33.....POOR
          34-54.....FAIR
          55-100.....GOOD.
VENTILATION INDICES NORMALLY DROP TO POOR AFTER SUNSET.

END/dsl